From 35f1fea3fcd44546a6cf074029c284c64ad25b3c Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Tue, 22 May 2018 22:52:14 +0100 Subject: [PATCH] gdb/x86: Fix `-Wstrict-overflow' build error in `i387_collect_xsave' Make `i' defined within `i387_collect_xsave' unsigned, removing a `-Werror=strict-overflow' compilation error: .../gdb/i387-tdep.c: In function 'void i387_collect_xsave(const regcache*, int, void*, int)': .../gdb/i387-tdep.c:1348:1: error: assuming signed overflow does not occur when assuming that (X + c) < X is always false [-Werror=strict-overflow] i387_collect_xsave (const struct regcache *regcache, int regnum, ^ cc1plus: all warnings being treated as errors Makefile:1610: recipe for target 'i387-tdep.o' failed make: *** [i387-tdep.o] Error 1 seen with GCC 5.4.0, a commit 8ee22052f690 ("gdb/x86: Handle kernels using compact xsave format") regression. While `regnum' can be -1 on entry to the function, to mean all registers, `i' is only used with non-negative register numbers. gdb/ * i387-tdep.c (i387_collect_xsave): Make `i' unsigned. --- gdb/ChangeLog | 4 ++++ gdb/i387-tdep.c | 2 +- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index b17512b943..d5cd413b59 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,7 @@ +2018-05-22 Maciej W. Rozycki + + * i387-tdep.c (i387_collect_xsave): Make `i' unsigned. + 2018-05-22 Pedro Alves * remote-fileio.c (remote_fileio_reply, remote_fileio_ioerror) diff --git a/gdb/i387-tdep.c b/gdb/i387-tdep.c index 3effc35b17..fdd83f109e 100644 --- a/gdb/i387-tdep.c +++ b/gdb/i387-tdep.c @@ -1354,7 +1354,7 @@ i387_collect_xsave (const struct regcache *regcache, int regnum, gdb_byte *p, *regs = (gdb_byte *) xsave; gdb_byte raw[I386_MAX_REGISTER_SIZE]; ULONGEST initial_xstate_bv, clear_bv, xstate_bv = 0; - int i; + unsigned int i; enum { x87_ctrl_or_mxcsr = 0x1, -- 2.34.1